Morphology controlled synthesis of Ba4Bi3F17:Er3+,Yb3+ and the dual-functional temperature sensing and optical heating applications
Design and synthesis of new fluoride upconversion (UC) luminescent materials with controllable morphologies remains a challenge. Here, novel Ba 4 Bi 3 F 17 :Er 3+ /Yb 3+ UC nanoparticles (UCNPs) were discovered and prepared using a simple one-step solvothermal strategy, and the modulation of the morphology and particle size was investigated in detail. Upon 980 nm excitation, the influence of dosage amounts of Yb 3+ /Er 3+ , and the environmental temperatures on the UC luminescent performance were studied in the temperature range of 293–393 K. The maximum relative sensitivities ( S r ) of Ba 4 Bi 3 F 17 :1 mol%Er, 13 mol%Yb material are calculated to be 0.0122 K -1 and 0.0167 K −1 at 293 K, respectively, based on the two energetic levels of ( 2 H 11/2 , 4 S 13/2 ) and ( 2 H 11/2 , 4 F 9/2 ). In addition, the internal heating performance of the Ba 4 Bi 3 F 17 :Er 3+ /Yb 3+ UCNPs was also evaluated in the pump power range of 112–901 mW, and the internal temperature of the UCNPs increased from 296 to 367 K with the increase of excitation power. This work initiates the discovery of the new bismuth-based fluoride nanothermometers and demonstrates the great potential for bifunctional applications in temperature sensing and optical heater devices.
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